Can u help me with these math questions?.

Use the normal approximation to the binomial distribution to answer this question. fifteen percent of all students at a large university are absent on mondays. if a random sample of 12 names is called on a monday, what is the probability that four students are absent?

15 point ! ~ see if you know the answer to both you!

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg